821223282 has 64 divisors (see below), whose sum is σ = 1912112640. Its totient is φ = 232502400.

The previous prime is 821223253. The next prime is 821223307. The reversal of 821223282 is 282322128.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87057 + ... + 96027.

It is an arithmetic number, because the mean of its divisors is an integer number (29876760).

Almost surely, 2^821223282 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 821223282, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (956056320).

821223282 is an abundant number, since it is smaller than the sum of its proper divisors (1090889358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821223282 is a wasteful number, since it uses less digits than its factorization.

821223282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9079.

The product of its digits is 6144, while the sum is 30.

The square root of 821223282 is about 28656.9935966772. The cubic root of 821223282 is about 936.4553700483.

The spelling of 821223282 in words is "eight hundred twenty-one million, two hundred twenty-three thousand, two hundred eighty-two".